化工新型材料

化工新型材料 ›› 2019, Vol. 47 ›› Issue (12) : 261-265.

开发与应用

TiO₂/RGO纳米复合光催化剂的制备及性能研究

刘乃亮, 连欣巧, 姚秉华, 魏婷婷, 靳盼盼

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Preparation and characterization of TiO₂/RGO nanocomposite photocatalyst

Liu Nailiang, Lian Xinqiao, Yao Binghua, Wei Tingting, Jin Panpan

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Received		Published
2018-07-13		2019-12-20
Issue Date	Revised Date
2020-01-03	2018-07-13

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摘要

以硫酸钛为钛源、抗坏血酸为还原剂,以氧化石墨烯(GO)表面活性基团为结合位点,采用一步水热法还原得到二氧化钛/还原氧化石墨烯(TiO₂/RGO)纳米复合光催化剂。扫描电子显微镜分析表明TiO₂为球状颗粒,尺寸为80～100nm,均匀分布在透明薄纱状RGO表面和层间。比表面积(BET)和紫外-可见光漫反射(UV-Vis)测试表明,TiO₂/RGO纳米复合光催化剂的禁带宽度为3.02eV,比表面积为101m²/g,平均孔径为6.61nm,对光的吸收由纯TiO₂的384nm扩展到410nm,具有较好的可见光响应性。亚甲基蓝(MB)光催化降解实验表明,在光照120min时MB的降解率可以达到97.8%,重复使用5次后,催化降解能力仍保持在95.2%。TiO₂/RGO纳米复合光催化剂具有可见光响应能力,高催化活性和稳定性,原因是RGO作为TiO₂的载体为电子和空穴提供了迁移通道,有效地防止了电子空穴对复合。

Abstract

The TiO₂/RGO nanocomposite photocatalyst was synthesized by one-step hydrothermal reduction with titanium sulfate as titanium source,ascorbic acid as reducing agent and GO as template.The SEM scanning showed that TiO₂ was spherical with a size of 80～100nm and distributed uniformly on the transparent RGO surface and interface.The measurements of BET and UV-Vis illustrated that the band gap of TiO₂/RGO was 3.02eV,the specific surface area was 101m²/g,the average pore size was 6.61nm,and the absorption of light increased from 384nm of pure TiO₂ to 410nm.The photocatalytic degradation test of MB showed that the degradation rate of MB could reach 97.8% after 120 minutes,and the catalytic degradation ability remained at 95.2% after five times repeating.The experimental results shown that the TiO₂/RGO had the ability of visible light response,high catalytic activity and stability.The reason was that RGO as the carrier template of TiO₂ provided a migration channel for electron and hole,which effectively prevented the electron hole from recombination.

关键词

二氧化钛 / 还原氧化石墨烯 / 一步水热法 / 光催化降解 / 亚甲基蓝

Key words

TiO₂ / RGO / one-step hydrothermal process / photocatalytic degradation / methylene blue

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TiO₂/RGO纳米复合光催化剂的制备及性能研究[J]. 化工新型材料, 2019, 47(12): 261-265 DOI:

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